Improvement in latches



0.13. SMITH 8v G. llRlClL Latch.

Patented Sept. 2, 1879..

wwwa f am.

. MA PEIERS, PHOTO L TI-Io 4UNTTEID STATES PATENT OEEIGE.

CHARLES E. SMITH AND CHARLES E. FRENCH, OF GOFFSTOWN, N. H.

IM PROVEVM ENT IN LATCHES.

Specification forming part of Letters Patent No. `219,316, datedSeptember 2, 1879; application filed January 19, 1878.

-or spindle; and it consists of certain details of construction, wherebythe apparatus is made more simple and efficient, easier of application,and of better appearance when in place upon the door.

In the drawings hereunto-attached and forming part of thisspecification, Figure l represents, in perspective, the section of thedoor, showing` the lock-latch in place. Fig. 2 is a side elevation withknob and outer disk removed from the latch. Fig. 3 is a horizontalsection taken centrally through the knobs and shaft. Fig. 4. is a planview of the locking apparatus. Fig. 5 is a -side view of the knob 'witha device for adjusting the latch to different thicknesses of door.

In Fig. 3, a represents the sheath or casing for the bolt. It is castpreferably round, flattened upon two sides for a part of its length, andis adapted to be inserted into a round hole bored into the door. Theouter end is provided with a flange, and inside the flange for a shortdistance the shell is threaded, in order that ir. may be heldin placemore se.- curely Within the door. l y

The shell is cast in two parts, as indicated in Fig. 3, the parts beingprovided with lugs for holding them accurately in place in the or dinarymanner. The interior is formed to iit the rectangular bolt, and isprovided with a square lug, b, which serves as a support on one side forthe spring. The slots c o are formed in the flattened sides of the case,for the purpose which will be hereinafter' pointed out.

The bolt is shown in section in Fig. 3. It is of ordinary form, slottedto receive a spring, d, and provided with a round hole at the rear end,through which passes the shaft or spindle e. This shaft also passesthrough the slots o c in the shell. These slots are extended through thedoor on each side, and through the disks ff, so that the shaft of theknob may be moved directly backward a sufficient distance to draw thebolt entirely withinits case. This backward movement ofthe bolt iseffected by a device shown in Fig. 2. This consists of Va yoke, g,having a square perforation to allow it to fit snugly over the shaft ofthe knob. It is provided at each end with a projection, which extendsover a pin, h, fixed in the plate f. The front edge of this yoke gisformed upon such a curve that when the knob is turned in eitherdirectionthe yoke will bear upon the pin upon one side or the other,according to the direction of the turning, and, acting upon the pin as afulorum or support, will throw the shaft backward to the rear of theslot, and thus draw the bolt into the case.

The yoke may be placed upon both sides, if

desired. It is covered by an outer disk or rose, i, which may beornamented in any suitable manner. On the inside of the door We formthis outer disk, i, with a circular recess, into which fits a disk, 7c.(Shown clearly in Figs. l and 4t.) This disk is provided with a slotcorresponding to that through which the shaft of the knobs moves. It isheld securely in place by the bead or raised edge m formed around it,and is provided with small'knobs or pins n a, by which it may be turned.

When turned as shown in dotted lines in Fig. 4, so as to registerexactly with the slotin the case, the shaft may be thrown backward towithdraw the bolt; but when turned at right angles or in any approximateposition sufficiently out of register with the inner slot it locks theshaft against any backward movement, and thereby prevents the bolt frombeing thrown backward.

The shaft of the knobs has been described as passing through a slot inthe casing. This is a feature of material advantage, as it prevents thecase 'from turning should it become loose by shrinkage or otherwise.

In Fig. 5 we have shown a sleeve, o, provided with a flangecorresponding to that ordinarily formed upon .the shank of the knob andiitted internally to a plain cylindrical shaft. It is formed with adiagonal slot, p,

and a set-screw, q, whereby it may be adjustably attached tothe shank ofthe knob, and moved in or ont upon the said shank, accordingy to thethickness of the door.

NVe are aware that a latch constructed to be thrown back by a shaftmoving laterally in a slot in the door is not new.

Having thus described our invention, what we claim, and desire to secureby Letters Patent of the United States, is-

1. rlhe slotted disk 7c, in combination with the slotted rose or diskz', the slotted case, the

shaft or spindle of the knob, and the bolt, as set forth.

2. The sleeve o, provided with an inclined slot, in combination with theset-screw and shank of the knob, as set forth.

CEAS. E. SMITH. CHARLES E. FRENCH. Witnesses:

JAMES H. CoNNEE, WALLACE CALDWELL.

